Import JSON file in Variable

Hi everyone,

I have been trying to import JSON file in Figma variables, But run into error all the time.
This is my JSON code, what I’m doing wrong? is there any documentation for JSON format?

[
  {
    "name": "neutral/50",
    "type": "COLOR",
    "value": "#F6F5F4",
    "description": "Page backgrounds, app canvas"
  },
  {
    "name": "neutral/600",
    "type": "COLOR",
    "value": "#796F6B",
    "description": "Tertiary text, metadata"
  },
  {
    "name": "neutral/700",
    "type": "COLOR",
    "value": "#5E5652",
    "description": "Body text alternative"
  },
  {
    "name": "neutral/800",
    "type": "COLOR",
    "value": "#453E3B",
    "description": "High-emphasis body text"
  },
  {
    "name": "neutral/900",
    "type": "COLOR",
    "value": "#2D2825",
    "description": "Primary text (≈ Encre)"
  },
  {
    "name": "neutral/950",
    "type": "COLOR",
    "value": "#1D1A18",
    "description": "Maximum contrast text"
  }
]